Kenmore 33176 Owners Manual - Page 23

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Conditions

Thermal

Expansion

Property

Damage

Hazard

-

Avoid

water

heater

damage.

-

Install

thermal

expansion

tank

or device

if necessary,

•

Contact

qualified

installer

or

service

agency.

Water

supply

system

may,

because

of such

events

as high

line

pressure,

frequent

cut-offs,

and

the

effects

of

water

hammer

have

installed

devices

such

as pressure

reducing

valves,

check

valves,

back

flow

preventers,

etc.,

to

control

these

types

of

problems.

When

these

devices

are not equipped

with

an internal

by-pass,

and

no other

measures

are

taken,

the

devices

cause

the

water

system

to

be closed.

As water

is heated,

it expands

(thermal

expansion)

and

closed

systems

do

not

allow

for

the

expansion

of

heated

water.

The

water

within

the

water

heater

tank

expands

as

it is heated

and

increases

the

pressure

of the

water

system.

If the

relieving

point

of

water

heater's

temperature-pressure

relief

valve

is

reached,

the

valve

will

relieve

the

excess

pressure.

The

temperature-pressure

relief

valve

is

not

intended

for

the

constant

relief

of

thermal

expansion.

This

is an unacceptable

condition

and

must

be

corrected.

WATER

HEATER

COLD

WATER

iNLET

FiTTiNG

FLOOR,

CEiLiNG

JOIST,

ETC.

\

lIZ

HOT

\COLD

II

II

/111

--sTRAPP'No

(3)

I====

fll-lrlh

PRESaURE

/

]_

II II

IN

REDUCING

\

II

II

II

/

_,.

VALVEWITH

"--4J---u--u--"--

(1)

BY-PASS

I

EXPANSION

/

I

Jl

GAUGE

iNLET

COLD

I

J

WATER

SHUT-OFF

ALTERNATE

RECOMMENDEDINSTALLATION

(HORIZONTAL

MOUNTING)

FmGURE 26A.

Thermal

Expansion

Tank Specifications

Tank

Model

Capacity

Number

In

Gallons

153.331050

5

Dimensions

Pipe

in

Inches

Fitting

Diameter

Length

On Tank

11 (279 ram)

14-3/4 (375 mm)

3/4" Male

NOTE:

Expansion

tanks

are

pre-charged

with

a 40

psi

air

charge.

If the

inlet

water

pressure

is

higher

than

40 psi,

the

expansion

tank's

air

pressure

must

be

adjusted

to

match

that

pressure,

but

must

not

be

higher

than

80

psi.

It is recommended

that

any

devices

installed

which

could

create

a

closed

system

have

a

by-pass

and/or

the

system

have

an

expansion

tank

or device

to relieve

the pressure

built

by thermal

expansion.

Thermal

expansion

tanks

are

available

from

Sears

stores

and

through

the

Sears

Service

Centers.

Contact

the

local

plumbing

inspector,

water

supplier

and/or

the

Sears

Service

Center

for assistance

in controlling

these

situations,

see

Figure

26

and

Figure

26 A.

WATER HEATER

(3)

(VERTICAL

MOUNTING)

FIGURE

26.

Strange

Sou

nds

Possible

noises

due to expansion

and

contraction

of some

metal

parts

during

periods

of heat-up

and

cool-down

do

not represent

harmful

or dangerous

conditions.

Condensation

causes

sizzling

and

popping

within

the

burner

area

during

heating

and

cooling

periods

and

should

be

considered

normal.

See

Condensation

section.

Draft Hood

Operation

Check

draft

hood

operation

by

performing

a

worst

case

depressurization

of

the

building.

With

all doors

and

windows

closed,

and

with

all air

handling

equipment

and

exhaust

fans

operating

such

as furnaces,

clothes

dryers,

range

hoods

and

bathroom

fans,

a

match

flame

should

still

be

drawn

into

the

draft

hood

of the

water

heater

with

its burner

firing.

If the

flame

is not

drawn

toward

the

draft

hood,

shut

off

water

heater

and

make

necessary

air

supply

changes

to correct.

Condensation

23

Whenever

the

water

heater

is

filled

with

cold

water,

some

condensate

will form

while

the

burner

is on. A water

heater

may

appear

to

be

leaking

when

in fact

the

water

is condensation.

This

usually

happens

when:

Kenmore 33176 Owners Manual - Page 23

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